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Sounds really cool!😎🚀 To propel the rocket upwards you need fuel (water-power) - we can call this force 'thrust' - you can represent this as an arrow below the rocket pushing it up. Against the rocket you will have two forces - air resistance & gravity. You can represent these as smaller arrows above the rocket pushing it down. The rocket accelerates up for as long as the thrust force (pushing up) is greater than the downwards forces (gravity & air resistance).
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